The Earth had become a wasteland of deserts as the
survivors work to rebuild communities. Daigo Otaki is a young orphan
raised by his uncle. Becoming an adult, Daigo discovers that Victor City
was in fact planned by his father who was a genius scientist. Daigo's
sister Saori had been managing it. She plead Daigo to take on the
inheritance that Daigo's father left him, a super robot system known as
Gordian.

Daigo would join the Mechacon mechanic combat 18th regiment unit, an
organization of law enforcers that defend Victor City against attacks
from the Madokuta organization. The pilot Daigo Otaki controls a small
almost human-sized robot container named Protteser. Each time Protteser
is in trouble, he jumps into the next biggest robot container named
Delinger. Then finally the largest container is Garbin.